Same issue with our CAX30. I've called Netgear and Spectrum twice today, each. Absolute futility.
Noticed this morning my Google Home couldn't connect to the internet. I reset the router. That usually works, but not this time.
So I did a WiFi scan and noticed the SSID, aka wireless network name, was not found. Very odd.
I thought perhaps the network name was hidden, so tried to manually connect by entering the SSID name. It wouldn't connect, which means the router was not broadcasting the wireless network.
Called Spectrum. Spectrum pinged my router, and says internet works fine on their end. Downstream and upstream links are solid white, indicating a connection to the ISP.
Tried a wired connection with multiple Ethernet cables and finally discovered it's not the cables, it's the ports on the router itself. They're disabled.
Based on other posts here and on Reddit, it sounds like Netgear pushed a firmware update that caused the CAX30 to disable SSID broadcasting entirely AND disabled the Ethernet ports. Probably a port security feature that makes sense for enterprise networks but is dumb as shyte for home networks.
Netgear said no support unless you give us money, honey. I said I could support this myself if the ports weren't disabled and I could log in to the router.
Netgear rep instructed me to reset the router 4 times. Guess what? Still doesn't work. And I had already done that several times myself before I called support.
Anyway, it's a brick now. And WHEN or IF Netgear will push out a firmware fix is a mystery.
Done with Netgear after this, for sure.
